momentum

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Across
  1. 1. push or pull to change an object velocity
  2. 3. force over time
  3. 6. weight of something
  4. 7. two objects come in contact with each other
  5. 8. speed in a particular direction
  6. 9. return back to original state
Down
  1. 2. all objects moving apart from one another
  2. 4. mass in motion
  3. 5. not elastic
  4. 8. quantity with both magnitude and direction